Abstract: A compacting device located forwardly of a body, especially a close body of a high capacity semitrailer which received by gravity, through an opening formed in a forward upper part of the body, mainly household or industrial waste products as well as any other products of low density. The device compresses two parts moveable one with respect to each other which includes a compacting shield capable of moving above the bottom of the body and an apron capable of moving above the shield, with controls to control the motions of the shield and the apron, and two other moveable supporting parts including supporting a carriage and a slider supporting the controls, in the first phase move, and the motion of the shield and the apron, in a second time phase move, for total ejection of the waste products after transportation to a dump site.